Comment 46 for bug 990932

Hello again, i don't know if it is related to kernel. What i know is that the backlight keys function normally on login page of xubuntu but after i login it seems like some module or driver that i cannot determine is taking control of it and cannot set it step by step. It just goes to maximum or minimum, there is no way to change it step by step. Which module or driver can cause the problem, i think this is the crucial question.